# Copyright (2023) Beijing Volcano Engine Technology Ltd.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#     http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from abc import ABC, abstractmethod


class AstBuilder(ABC):
    """
        You can get multiple types of pasers, which can be the parser of the entire sql or the parser of an expression.

    """
    @abstractmethod
    def get_parser(self, stream):
        raise NotImplementedError("This method has not been implemented yet.")

    @abstractmethod
    def get_expr_ast(self, str):
        raise NotImplementedError("This method has not been implemented yet.")

    # 单条sql的ast
    @abstractmethod
    def get_query_ast(self, str, metamatcher=None):
        raise NotImplementedError("This method has not been implemented yet.")
